Addition of Three 3-Digit Numbers

We will learn addition of three 3-digit numbers.


Addition of Three 3-Digit Numbers Without Regrouping:

Adding three 3-digit numbers is same as adding two 3-digit numbers.

For examples:

Add 423112 and 260.

Solution:



Step 1: Arrange the numbers vertically.

Step 2: First add the ones. 3 + 2 + 0 = 5

 Step 3: Now, add the tens. 2 + 1 + 6 = 9

Step 4: Lastly, add the hundreds. 4 + 1 + 2 = 7

Addition of Three 3-Digit Numbers Without Regrouping

Thus, 423 + 112 + 260 = 795

Addition of Three 3-Digit Numbers With Regrouping:

Add 497, 125 and 124.

Solution:

Step 1: Arrange the numbers vertically.

Step 2: Add the ones column. 7 + 5 + 4 = 16 ones = 1 ten and 6 ones. Write 6 in the ones column and carry over 1 to the tens column.

Step 3: Add the tens column. 9 + 2 + 2 + 1 (carry over) = 14 tens = 1 hundred and 4 tens. Write 4 in the tens column and carry over 1 to the hundreds column.

Step 4: Add the hundreds column. 4 + 1 + 1 + 1 (carry over) = 7 hundreds.

Addition of Three 3-Digit Numbers With Regrouping

Thus, 497 + 125 + 124 = 746


Questions and Answers on Addition of Three 3-Digit Numbers:

1. Add the following Three 3-Digit Numbers Without Regrouping:

(i) 132 + 125 + 432

(ii) 320 + 220 + 459

(iii) 133 + 206 + 630

(iv) 351 + 133 + 400

(v) 233 + 654 + 11

(vi) 561 + 125 + 112

(vii) 615 + 131 + 202

(viii) 810 + 125 + 53


Answer:

1. (i) 132 + 125 + 432

(ii) 320 + 220 + 459

(iii) 133 + 206 + 630

(iv) 351 + 133 + 400

(v) 233 + 654 + 11

(vi) 561 + 125 + 112

(vii) 615 + 131 + 202

(viii) 810 + 125 + 53


2. Add the following Three 3-Digit Numbers With Regrouping:

(i) 281 + 435 + 209

(ii) 355 + 321 + 189

(iii) 240 + 107 + 573

(iv) 286 + 233 + 249

(v) 222 + 437 + 150

(vi) 109 + 420 + 371

(vii) 175 + 215 + 301

(viii) 482 + 239 + 101


Answer:

2. (i) 281 + 435 + 209

(ii) 355 + 321 + 189

(iii) 240 + 107 + 573

(iv) 286 + 233 + 249

(v) 222 + 437 + 150

(vi) 109 + 420 + 371

(vii) 175 + 215 + 301

(viii) 482 + 239 + 101






3rd Grade Math Lessons

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